The Harmonized Tariff System (HTS) provides duty rates for virtually every item that exists. Duty determination encompasses more factors than simply a classification number; such as country of origin, applicable tariff treatments, as well as special provisions. Customs makes the final determination of what the correct rate of duty is, not the importer. For specific duty information on a particular item you may request a Binding Ruling. The U.S. International Trade Commission – Tariff Database link is an interactive database that enables an importer to get an approximate idea of the duty rate for a particular product.